16 Jul
2024
16 Jul
'24
4:43 a.m.
Ok guys..latest...
I changed the ethrnet buffer to the 1475 figure. As I thought that fixed the packet
oversize problem. This problem was a overflow at the link level alone.
Please find the following.
NCP>show know lines cha
NCP>
21:30:46 NCP
Request # 13; Show Known Lines Characteristics Completed
Line = NI-0-0
Receive Buffers = 6
Controller = Normal
Protocol = Ethernet
Hardware Address = F2 0B A4 95 D5 98
Receive buffer size = 1476
NCP>
21:30:24 NCP
Request # 12; Show Executor Node Characteristics Completed
Executor Node = 41.403 (TOPS20)
Identification = DECnet-20 Version 4.0
Management Version = 4.0.0
Loop Count = 1
Loop Length = 127
Loop With = Mixed
Incoming Timer = 30
Outgoing Timer = 60
NSP Version = 4.0.0
Maximum Links = 65535
Delay Factor = 48
Delay Weight = 10
Inactivity Timer = 120
Retransmit Factor = 10
Routing Version = 2.0.0
Type = Routing IV
Routing Timer = 600
Broadcast Routing Timer = 40
Maximum Address = 1023
Maximum Circuits = 20
Maximum Cost = 100
Maximum Hops = 16
Maximum Visits = 20
Maximum Broadcast Nonrouters = 64
Maximum Broadcast Routers = 32
Maximum Buffers = 80
Buffer Size = 576
Segment Buffer Size = 576
NCP>
Event type 4.14, Node reachability change
Occurred 02-Jul-37 21:23:02.7 on node 41.401 (RST10)
Node address 41.208 (PI5)
Status = Reachable
Event type 4.14, Node reachability change
Occurred 02-Jul-37 21:23:02.7 on node 41.401 (RST10)
Node address 41.250 (4CAST)
Status = Reachable
Event type 34.0, Object spawned
Occurred 02-Jul-37 21:23:17.8 on node 41.401 (RST10)
Source node = 41.28 (28NH)
Source process = 0 NETMAPPER
Destination process = 19
User = 200,200
Password = ...
Request # 8; Set Node Completed
OPR>exit
$i decnet
Local DECNET node: TOPS20. Nodes reachable: 2.
Accessible DECNET nodes are: RST10 TOPS20
$
$
$
$dir
TOPS20:<OPERATOR>
FIX.T20.1
LOGIN.CMD.1
MAIL.TXT.1;P
NETSRV.LOG.1
USAG20.CHG.5
USAGE.OUT.5
Total of 202 pages in 6 files
$rename fix.t02 fix.t21
?No such file type - "fix.t02"
$dir
TOPS20:<OPERATOR>
FIX.T20.1
LOGIN.CMD.1
MAIL.TXT.1;P
NETSRV.LOG.1
USAG20.CHG.5
USAGE.OUT.5
Total of 202 pages in 6 files
$rename fix.t20 fix.t21
FIX.T20.1 => FIX.T21.1 [OK]
$r nft
NFT>copy MIM::HECNET:FIX.T20
Access information for node MIM::
User: guest
Account:
Password:
MIM::DU1:[DECNET]FIX.T20;282 => TOPS20:<OPERATOR>FIX.T20.1 [OK]
NFT>
This problem was coming from the fact that tops20 was reporting a max ethernet segment
size as 576 at the link level there was no way the entire decnet packet and the ethernet
overhead could fit in a 576 frame thus the 'packet oversize' fault.
The addition of the line
DECNET BUFFER-SIZE 1476
7-1-CONFIG.CMD in SYSTEM
I wanted to ask where these additional settings came from?
I cannot find reference to the above line anywhere.
Does anyone have the additional tops20 manual like decnet install manual etc or at least a
summary of settings?
Thank you all
DRFORBIN
solved the problem.